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| DOI | 10.1109/JSTARS.2024.3378572 |
| Cloud-Top Motion Variation of a Landfall Typhoon Observed by Geostationary Satellite Imagery | |
| 发表日期 | 2024 |
| ISSN | 1939-1404 |
| EISSN | 2151-1535 |
| 起始页码 | 17 |
| 卷号 | 17 |
| 英文摘要 | Typhoons' rapid variation makes effective hazard prevention difficult, which remains a challenging research topic requiring novel observation technology and analysis methodology. We developed an automatic methodology for mining the information on the rapid variation of typhoon cloud-top motion from high-spatial-temporal-resolution satellite cloud images, which has steps of estimating and decomposing the typhoon cloud-top motion, locating the typhoon cloud-top center, and analyzing the motion and center position variations. The Gaofen-4 satellite acquired 50-m-1-min-resolution cloud images of Typhoon Megi's (2016) landfall over mountainous Taiwan Island. The data provide an excellent chance to explore what such high-spatial-temporal-resolution successive observations can tell about the cloud-top motion variation of a typhoon landfall using the methodology. Before its landfall, Typhoon Megi's cloud-top center dramatically increased the northwestward migration speed from similar to 22 to similar to 58 km/h in only similar to 2.5 h. It also presented small-scale oscillation along its migration path with a 1.6-to-2.4-km amplitude, a 31-to-33-km spatial period, and a 1.46-to-1.48-h temporal period. We averaged the motion speeds (velocity magnitudes) in each motion field to assess the field strength. The so-calculated cloud-top average rotation speed of Typhoon Megi decreased quickly during landfall. Meanwhile, its average divergence speed increased dramatically by similar to 30% in a short period of similar to 2.5 h, reaching similar to 2 times the rotation speed. This result means that Megi's cloud-top motion rapidly changed from a typical rotation motion-dominated status to a divergence motion-dominated status. This rapid transformation from typical rotation motion dominance to divergence motion dominance implies intense upward warm and moist airflows that cause severe precipitation. |
| 英文关键词 | Atmospheric motion vectors (AMVs); field decomposition; geostationary satellite; motion field; tropical cyclone (TC); typhoon |
| 语种 | 英语 |
| WOS研究方向 | Engineering ; Physical Geography ; Remote Sensing ; Imaging Science & Photographic Technology |
| WOS类目 | Engineering, Electrical & Electronic ; Geography, Physical ; Remote Sensing ; Imaging Science & Photographic Technology |
| WOS记录号 | WOS:001200168400001 |
| 来源期刊 | IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303595 |
| 作者单位 | Ministry of Natural Resources of the People's Republic of China; Second Institute of Oceanography, Ministry of Natural Resources; Hohai University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); Imperial College London; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS; Shanghai Jiao Tong University; Nanjing University |
| 推荐引用方式 GB/T 7714 | . Cloud-Top Motion Variation of a Landfall Typhoon Observed by Geostationary Satellite Imagery[J],2024,17. |
| APA | (2024).Cloud-Top Motion Variation of a Landfall Typhoon Observed by Geostationary Satellite Imagery.IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING,17. |
| MLA | "Cloud-Top Motion Variation of a Landfall Typhoon Observed by Geostationary Satellite Imagery".IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING 17(2024). |
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